Angled TEK Nozzle, 240mm long SM-Modellbau # 2780

Total Energy Compensation for the Vario in the GPS-Logger 2!

The TEK nozzle is the ideal addition to our GPS-Logger 2. This has a TEK connection on the vario and, together with the TEK nozzle, enables a vario experience similar to that of manned gliders. Our TEK nozzle works according to the principle of the "Braunschweig Nozzle". Manned aviation almost exclusively uses this design today. Although the construction is more complex than the simple curved Nicks nozzle, it is unsurpassed in compensation and delivers perfect results even in model aircraft.

The nozzle is made entirely of stainless steel and hard-soldered. The nozzle head is scaled 1:2. This sounds larger than it is, as the original nozzles are very small. The nozzle appears correctly dimensioned on models of practically any size. The tube with a diameter of 2.5 mm is approximately 240 mm long and 40 mm high for the angled version for installation in the tail fin. In the original, this length is about 750 mm, so our nozzle has the correct length for a 1:3 scale model. For smaller models, the tube can be shortened slightly; for larger models, it could be extended and stiffened with a carbon fiber tube. The straight version for installation on the fuselage spine is approximately 120 mm long.

What is TEK anyway?

TEK simply means the suppression of "stick thermals" by taking into account the model's speed. This is achieved by connecting a TEK nozzle to the vario sensor. For slow models flying at a constant speed, a simple vario without TEK is often sufficient. Here, errors due to controlled altitude changes are not so great, and thermals can be easily recognized by the vario. The cleaner one flies and the smaller the speed changes, the better the vario works without a TEK nozzle. With dynamic models or even with an imperfect flying style, however, vario readings always occur that do not show the true climb and descent of the model, but only a controlled speed or altitude change, the "stick thermals". In fact, when searching for thermals, one is only interested in whether one is flying in rising, falling, or neutral air mass. As independently as possible of how the aircraft is currently moving. Exactly this behavior is achieved by using a TEK nozzle on the variometer. This nozzle generates a speed-dependent negative pressure and thus simulates a climb with increasing speed, which compensates for the altitude loss. So, when pushing down, the altitude decreases, and the vario without TEK would indicate a descent. The TEK nozzle compensates for this by indicating a climb for the increasing speed when pushing down. The conversion of altitude (potential energy) into speed (kinetic energy) is therefore no longer incorrectly interpreted as descent or climb with the TEK nozzle. Ideally, with complete compensation, the vario in absolutely calm air always shows the current sink rate of the aircraft. This is, of course, not a constant value, but depends on speed, lift, and other factors.

The connection between the TEK nozzle and the GPS-Logger 2 is made with the separately available nozzle holder, item no. 2785, and the hoses included there.

Scope of delivery:

• Angled TEK nozzle made of stainless steel